Author probably could have chosen a better example such that it doesn't look like the author chose letters sequently. In this case the letters are meaningful as

Author probably could have chosen a better example such that it doesn't look like the author chose letters sequently. In this case the letters are meaningful as they are the same as the first of the table name, a common convention, unfortunately that happens to be the first two letters of the alphabet...which yes, would be very annoying.